Abstract Effective absorption of low-frequency waterborne sound with subwavelength absorbers has always been a challenging work.In this paper, we derive two theoretical requirements for broadband perfect absorption Ring Toss of low-frequency waterborne sound by ultrathin acoustic metasurface under a finite-thickness steel plate followed by semi-inf
The coronavirus disease 2019 (COVID-19) pandemic is strongly changing the way most people live their lives, and disrupting specialist healthcare systems.Such public health disruptions have resulted in significant collateral damage with particular implications for vulnerable populations, including the perinatal population.This Study aims to estimate
Few intellectuals are naturally born or bred democrats.Rather, self-reliant thinkers are likely to be dissenters to conventional wisdom, and spurners of democratic compromise.And the democratic public does not appreciate intellectuals either.Their adventures of thinking, after all, are not mass products.Yet, the project of OEM Back Up Camera Interf
Monoterpenes play an important role in atmospheric chemistry due to strapu their large anthropogenic and biogenic emission sources and high chemical reactivity.As a consequence, measurements are required to assess how changes in emissions of monoterpenes impact air quality.Accurate and comparable measurements of monoterpenes in indoor and outdoor e